I am new to go lang and I want to print the individual byte of array of string
as in below code I want to print the values 'h','e','l','l','o' once at a time but I am not able to do the same.
func main() {
strslice := make([]string, 4, 5)
strslice[0] = "hello"
strslice[1] = "go"
strslice[2] = "lang"
strslice[3] = "whatsup"
for i := 0; i < len(strslice[i]); i++ {
fmt.Printf("slice is %c \n", strslice[i])
}
}
In Go, character literals are stored in a string as a variable-width sequence of UTF-8 encoded bytes. The ASCII code points (0x00..0x7F) occupy one byte. Other code points occupy two to four bytes. To print code points (characters) separately,
package main
import "fmt"
func main() {
strslice := make([]string, 5, 5)
strslice[0] = "hello"
strslice[1] = "go"
strslice[2] = "lang"
strslice[3] = "whatsup"
strslice[4] = "Hello, 世界"
for _, s := range strslice {
for _, c := range s {
fmt.Printf("%c ", c)
}
fmt.Printf("\n")
}
}
Output:
h e l l o
g o
l a n g
w h a t s u p
H e l l o , 世 界
Here's an illustration of the difference between UTF-8 encoded bytes and characters,
package main
import "fmt"
func main() {
str := "Hello, 世界"
fmt.Println("Bytes:")
for i := 0; i < len(str); i++ {
fmt.Printf("'%c' ", str[i])
}
fmt.Printf("\n")
fmt.Println("Characters:")
for _, c := range str {
fmt.Printf("'%c' ", c)
}
fmt.Printf("\n")
}
Output:
Bytes:
'H' 'e' 'l' 'l' 'o' ',' ' ' 'ä' '¸' '' 'ç' '' ''
Characters:
'H' 'e' 'l' 'l' 'o' ',' ' ' '世' '界'
References:
One possible approach:
func main() {
strslice := make([]string, 4, 5)
strslice[0] = "hello"
strslice[1] = "go"
strslice[2] = "lang"
strslice[3] = "whatsup"
for i := 0; i < len(strslice); i++ {
for j := 0; j < len(strslice[i]); j++ {
fmt.Printf("slice[%d] is %c \n", i, strslice[i][j])
}
}
}
Demo. As you see, each strslice element is iterated in a nested for loop, using its own loop variable (j).
In strslice[i][j], i is used to access an element of slice (a string), and j is used to access a specific byte of this string.
Note that it's byte, not character - because that's exactly what has been asked. But check wonderful @peterSO's answer if you actually want to print out each character of the string - as there's a big chance you do. )
for i := 0; i < len(strslice[0]); i++ { fmt.Printf("slice is %c \n", strslice[0][i])does the trick.